reactos/include/reactos/libs/mbedtls/entropy_poll.h

   1 /**
   2  * \file entropy_poll.h
   3  *
   4  * \brief Platform-specific and custom entropy polling functions
   5  *
   6  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   7  *  SPDX-License-Identifier: Apache-2.0
   8  *
   9  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
  10  *  not use this file except in compliance with the License.
  11  *  You may obtain a copy of the License at
  12  *
  13  *  http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  *  Unless required by applicable law or agreed to in writing, software
  16  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  17  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  *  See the License for the specific language governing permissions and
  19  *  limitations under the License.
  20  *
  21  *  This file is part of mbed TLS (https://tls.mbed.org)
  22  */
  23 #ifndef MBEDTLS_ENTROPY_POLL_H
  24 #define MBEDTLS_ENTROPY_POLL_H
  25
  26 #if !defined(MBEDTLS_CONFIG_FILE)
  27 #include "config.h"
  28 #else
  29 #include MBEDTLS_CONFIG_FILE
  30 #endif
  31
  32 #include <stddef.h>
  33
  34 #ifdef __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 /*
  39  * Default thresholds for built-in sources, in bytes
  40  */
  41 #define MBEDTLS_ENTROPY_MIN_PLATFORM     32     /**< Minimum for platform source    */
  42 #define MBEDTLS_ENTROPY_MIN_HAVEGE       32     /**< Minimum for HAVEGE             */
  43 #define MBEDTLS_ENTROPY_MIN_HARDCLOCK     4     /**< Minimum for mbedtls_timing_hardclock()        */
  44 #define MBEDTLS_ENTROPY_MIN_HARDWARE     32     /**< Minimum for the hardware source */
  45
  46 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
  47 /**
  48  * \brief           Platform-specific entropy poll callback
  49  */
  50 int mbedtls_platform_entropy_poll( void *data,
  51                            unsigned char *output, size_t len, size_t *olen );
  52 #endif
  53
  54 #if defined(MBEDTLS_HAVEGE_C)
  55 /**
  56  * \brief           HAVEGE based entropy poll callback
  57  *
  58  * Requires an HAVEGE state as its data pointer.
  59  */
  60 int mbedtls_havege_poll( void *data,
  61                  unsigned char *output, size_t len, size_t *olen );
  62 #endif
  63
  64 #if defined(MBEDTLS_TIMING_C)
  65 /**
  66  * \brief           mbedtls_timing_hardclock-based entropy poll callback
  67  */
  68 int mbedtls_hardclock_poll( void *data,
  69                     unsigned char *output, size_t len, size_t *olen );
  70 #endif
  71
  72 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
  73 /**
  74  * \brief           Entropy poll callback for a hardware source
  75  *
  76  * \warning         This is not provided by mbed TLS!
  77  *                  See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
  78  *
  79  * \note            This must accept NULL as its first argument.
  80  */
  81 int mbedtls_hardware_poll( void *data,
  82                            unsigned char *output, size_t len, size_t *olen );
  83 #endif
  84
  85 #ifdef __cplusplus
  86 }
  87 #endif
  88
  89 #endif /* entropy_poll.h */